Class 8 Microorganisms Friend And Foe CBSE Questions & Answers

Class 8 · Microorganisms Friend And Foe

This is Science Class 8 Microorganisms Friend And Foe CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Oldest method of food preservation is :
  • A
    dehydration
    Correct
  • B
    chemical preservatives
  • C
    pasteurization
  • D
    deep freezing
2
Which of the following fix atmospheric organisms?
  • A
    some blue green algae
    Correct
  • B
    some bacteriophages
  • C
    some protozoa
  • D
    some fungi
3
Rhizobium can live in the root nodules of :
  • A
    lettuce
  • B
    soyabean
    Correct
  • C
    pine
  • D
    lemon
4
Pathogens can spread by which medium/s:
  • A
    air & water
  • B
    all of these
    Correct
  • C
    housefly
  • D
    food
5
Entry of a pathogen into the body of a healthy person is called :
  • A
    indication
  • B
    injury
  • C
    inflammation
  • D
    infection
    Correct
6
The group of microbes that help to clean up our environment are called :
  • A
    nitrifying microbes
  • B
    pathogens
  • C
    decomposers
    Correct
  • D
    red and brown algae
7
Leeuwenhoek observed in a drop of pond water:
  • A
    viruses
  • B
    living microorganisms
    Correct
  • C
    dead cork cells
  • D
    fungi
8
Salting of food can inhibit growth of :
  • A
    protozoa
  • B
    fungi
  • C
    virus
  • D
    bacteria
    Correct
9
Nitrogen fixing bacteria are :
  • A
    both free living & symbiotic
    Correct
  • B
    parasitic
  • C
    symbiotic
  • D
    free living
10
Fish and meat can be preserved by :
  • A
    pasteurization
  • B
    smelting
  • C
    smoking
    Correct
  • D
    pickling
11
Microbes are tiny organisms visible only under :
  • A
    hand lens
  • B
    microscope
    Correct
  • C
    water film
  • D
    oil film
12
Which of the following is not a microbe:
  • A
    YAK
    Correct
  • B
    HIV
  • C
    AMOEBA
  • D
    YEAST
13
Viruses show characteristics of :
  • A
    non
  • B
    Both living & non
    Correct
  • C
    prokaryotes
  • D
    living
14
Which of following is cyanobacteria :
  • A
    bacteria
  • B
    blue-green algae
    Correct
  • C
    Rhizobium
  • D
    mushroom
15
Bacterium can never be :
  • A
    saprophytic
  • B
    symbiotic
  • C
    holozoic
    Correct
  • D
    autotrophic